Chemistry and Physics of Solid Surfaces VI - download pdf or read online

By J. H. Block (auth.), Professor Ralf Vanselow, Dr. Russell Howe (eds.)

ISBN-10: 3642827276

ISBN-13: 9783642827273

ISBN-10: 3642827292

ISBN-13: 9783642827297

This quantity comprises evaluate articles which have been written by means of the invited converse­ ers of the 7th foreign summer season Institute in floor technology (ISISS), held on the college of Wisconsin - Milwaukee in July 1985. the shape of ISISS is a suite of educational assessment lectures awarded over a one-week interval by means of the world over famous specialists on quite a few elements of floor technology. every one speaker is requested, additionally, to put in writing a overview article on his lecture subject. No unmarried quantity within the sequence Chemistry and Physics of reliable Surfaces can potentially disguise the complete box of contemporary floor technology. even if, the sequence as a complete is meant to supply specialists and scholars alike with a entire set of stories and literature references, rather empha­ sizing the gas-solid interface. The gathered articles from past summer time Institutes were released less than the next titles: floor technology: contemporary growth and views, Crit. Rev. reliable kingdom Sci. four, 125-559 (1974) Chemistry and Physics of sturdy Surfaces, Vols. I, II, and III (CRC Press, Boca Raton, FL 1976, 1979 and 1982), Vols. IV and V, Springer Ser. Chern. Phys., Vols. 20 and 35, (Springer, Berlin, Heidelberg 1982 and 1984). the sphere of catalysis, which has supplied the main impetus for the de­ velopment of recent floor technology, misplaced of its pioneers in the course of 1984 and 1985: Professors G.-M. Schwab (1899-1984) and p.k. Emmett (1900-1985).

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4,5]. Alkanes and cycloalkanes in the petroleum fraction were converted extensively to aromatic hydrocarbons, which impart excellent "anti-knock" properties to gasolines used as fuels in internal combustion engines. Another reaction which occurred was the isomerization of n-alkanes to branched alkanes. The latter also have improved anti-knock properties. Platinum on alumina possesses two different types of catalytic functions, and is therefore known as a bifunctional catalyst. One function is associated with platinum sites, which catalyze hydrogenation and dehydrogenation reactions, while the other is associated with acidic sites on the alumina, which readily catalyze reactions involving a rearrangement of the carbon skeleton of hydrocarbon molecules containing carbon-carbon double bonds.

Another was the great opportunities afforded by gas phase chromatography to facilitate mechanistic studies in a variety of ways, including the so-called microcatalytic pulse technique devised by Kokes, Tobinand Emmett in 1954. Finally, one that involved me directly was Paul's curiosity about the new ideas concerning electronic factors versus geometric factors in catalysis. These stemmed from the earlier work of Schwab (1946) as amplified in papers by Dowden, Volkenstein, and particularly Otto Beeck, who published results from a remarkable series of experiments in 1950-52 which introduced the concept of percentage d-character as a correlating parameter for a series of transition metals.

3 Isomerization As discussed earlier, isomerization reactions of alkanes and cycloalkanes occur very readily on bifunctional catalysts containing both metal and acidic components. 44, 59,60J. While it has been shown that a purely metal-catalyzed isomerization process can occur, the findings do not challenge the commonly accepted mode of action of bifunctional reforming catalysts in which separate metal and acidic sites parti ci pate in the reacti on. The data avail ab 1e for conditi ons commonly used with commercial reforming catalysts indicate that a purely metal catalyzed process does not contribute appreciably to the overall isomerization reaction on a bifunctional catalyst.

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Chemistry and Physics of Solid Surfaces VI by J. H. Block (auth.), Professor Ralf Vanselow, Dr. Russell Howe (eds.)

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